What should I do? Any suggestions?

I got a iPhone 3Gs from a third party about a week or so ago. I charge it all night so it has a full battery for my day at college. But for some reason when I want to send a text at say 8:30 am it decides to turn off and then I can't turn it back on for the rest of the day as it just comes up with the logo and then turns off. Any suggestions would be lovely.

Go into a phone shop - they probably won't fix it due to it being from a third party however they might give you some advice

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